How to simulate a simple cmos oscillator?

oscillator

Hello All

I am sorry to send a mail here to ask for your advice
I am given an assignment to simulate a cmos oscillator using any
software like ADS or LT spice.
I am new to electronics as I am from physics background and
currently just started my part time course in electronics.
I have not even gone through the course and now I have to simulate
something which I have not really have background on.
Any kind soul kindly advice me what does a cmos oscillator means?
I see oscillator which bipolar and mosfet type . But have not seen a
nmos and pmos (cmos) oscillator.
Anyone can show a good link/tutorial(IEEE paper) on how to simulate
a simple cmos oscillator (0.18um) . This is an assignment and should
be the simple type of oscillator. I am really a green horn here.
Kindly advise me
Thank you so much in advance

rgds and thanks
Jason

Re: oscillator

u can make a very easy cmos oscillator
by cascading three cmos inverter and make the input of the frist one is the output of the last one , this called a ring oscillator

and simlate it very easy but u must define a initial condition
that's it

and visit
**broken link removed**
u will find there a ring oscillator tutorial about ring oscillator design using @DS


khouly

oscillator

This is also a good book

Re: oscillator

Dear Khouly and Boy

Thanks a lot for the info given.
My title is to simulate a clapp LC oscillator. I found from website that clapp oscillator is the kind that utilises two series capacitors in its LC circuit instead of using inductor.
Can a simple ring oscillator in you mentioned be configured to have a clapp LC type?
Kindly explain in details.
If ring oscillator is not a choice, then what configuration I can go for in order to have the 0.18um Cmos technology for a clapp LC oscillator.
Kindly help

thank you


rgds and thanks
jason

Re: oscillator

dear jason_class

ring oscillator cannot be used with lc ,
if u want to design a clapp oscillator , it is not implemented in CMOS technology

the most used oscillator in CMOS technology is LC cross coupled
it is very famous , just search with CMOS VCO or oscillator

khouly

Re: oscillator

Dear Khouly

Thanks a lot.
But my the title given to me is LC Clapp oscillator in cmos technology 0.18um.
I will email and check with lecturer and will be back here for discussion.
Thank you for your advice.
Thank you very much Khouly

rgds and thanks
jason

Re: oscillator

Hi Jason,

Look for the book:

"Oscillator Design and Computer Simulation" by Randall W. Rhea, if I am right it should be somewhere on the forum,
"Microwave Circuit Design using Linear and Nonlinear" by Vendelin/Rohde/Pavio
(chapter 6 about the oscillators also on the forum:
)

and
hxxp://rerc.icu.ac.kr/UploadFile/DOC/Oscillator_Basics.pdf
(replace xx with tt)


Good luck

Al

Re: oscillator

Hi All

Sorry for the delay.
The links are great
Thank you
Cheers


Jason

Re: oscillator

here you can find some papers related to oscillators